Species: A basic taxonomy category. Population of individuals bearing
distinctive genes and gene frequencies, separated from other species by biological barriers
preventing gene exchange.
Evolution: Genetic changes in populations of organisms through time that lead to
differences among them.
Selection: A composite of all the forces that cause differential survival and
differential reproduction among genetic variants.
Phylogeny: The evolutionary history of a species or group of species in terms
of their derivations and relationships.
Life on Earth
The tree of life
Phylogeny in a nutshell